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Pt=120 m
Lt=80 m
Ltd=120-4-4=112 m
Ltd=80-4-4=72 m
L jln =(120×80)-(112×72)
L jln =9600-8064
L jln =1536m²
Lk=40×40=1600 cm²=0,16m²
n =1536/0,16
n =9600 buah
Jadi jawaban nomor 21=C.9600 buah
20.)
<CBD + <BCD + <BDC = 180°
180-7X+92+180-9X=180
452-16X=180
452-180=16X
272=16X
X =272/16
X =17
<CBD =180-7X
<CBD =180-7X17
<CBD =180-119
<CBD =61°
Nomor 20 isiannya C.61°
Nomor 21 isiannya C.9600 buah